diff --git a/fail2ban/server/filter.py b/fail2ban/server/filter.py
index 68968284..7c1c0df1 100644
--- a/fail2ban/server/filter.py
+++ b/fail2ban/server/filter.py
@@ -944,7 +944,7 @@ class Filter(JailThread):
 							ip = fid
 							raw = True
 				# if mlfid case (not failure):
-				if ip is None:
+				if fid is None and ip is None:
 					if ll <= 7: logSys.log(7, "No failure-id by mlfid %r in regex %s: %s",
 						mlfid, failRegexIndex, fail.get('mlfforget', "waiting for identifier"))
 					fail['mlfpending'] = 1; # mark failure is pending
diff --git a/fail2ban/server/ipdns.py b/fail2ban/server/ipdns.py
index b435c6df..6938d37d 100644
--- a/fail2ban/server/ipdns.py
+++ b/fail2ban/server/ipdns.py
@@ -304,9 +304,11 @@ class IPAddr(object):
 	"""
 
 	IP_4_RE = r"""(?:\d{1,3}\.){3}\d{1,3}"""
-	IP_6_RE = r"""(?:[0-9a-fA-F]{1,4}::?|::){1,7}(?:[0-9a-fA-F]{1,4}|(?<=:):)"""
+	IP_6_RE = r"""(?:[0-9a-fA-F]{1,4}::?|:){1,7}(?:[0-9a-fA-F]{1,4}|(?<=:):)"""
 	IP_4_6_CRE = re.compile(
 	  r"""^(?:(?P<IPv4>%s)|\[?(?P<IPv6>%s)\]?)$""" % (IP_4_RE, IP_6_RE))
+	IP_W_CIDR_CRE = re.compile(
+	  r"""^(%s|%s)/(?:(\d+)|(%s|%s))$""" % (IP_4_RE, IP_6_RE, IP_4_RE, IP_6_RE))
 	# An IPv4 compatible IPv6 to be reused (see below)
 	IP6_4COMPAT = None
 
@@ -360,13 +362,17 @@ class IPAddr(object):
 		# test mask:
 		if "/" not in ipstr:
 			return ipstr, IPAddr.CIDR_UNSPEC
-		s = ipstr.split('/', 1)
-		# IP address without CIDR mask
-		if len(s) > 2:
-			raise ValueError("invalid ipstr %r, too many plen representation" % (ipstr,))
-		if "." in s[1] or ":" in s[1]: # 255.255.255.0 resp. ffff:: style mask
-			s[1] = IPAddr.masktoplen(s[1])
-		s[1] = long(s[1])
+		s = IPAddr.IP_W_CIDR_CRE.match(ipstr)
+		if s is None:
+			return ipstr, IPAddr.CIDR_UNSPEC
+		s = list(s.groups())
+		if s[2]: # 255.255.255.0 resp. ffff:: style mask
+			s[1] = IPAddr.masktoplen(s[2])
+		del s[2]
+		try:
+			s[1] = long(s[1])
+		except ValueError:
+			return ipstr, IPAddr.CIDR_UNSPEC
 		return s
 		
 	def __init(self, ipstr, cidr=CIDR_UNSPEC):
diff --git a/fail2ban/tests/fail2banregextestcase.py b/fail2ban/tests/fail2banregextestcase.py
index 4b11ef9a..fe45bf4b 100644
--- a/fail2ban/tests/fail2banregextestcase.py
+++ b/fail2ban/tests/fail2banregextestcase.py
@@ -225,6 +225,13 @@ class Fail2banRegexTest(LogCaptureTestCase):
 		))
 		self.assertLogged('Lines: 1 lines, 0 ignored, 1 matched, 0 missed', all=True)
 		self.assertNotLogged('Unable to find a corresponding IP address')
+		# no confusion to IP/CIDR
+		self.pruneLog()
+		self.assertTrue(_test_exec(
+			"-d", "^Epoch", "-o", "id",
+			"1490349000 test this/is/some/path/32", "^\s*test <F-ID>\S+</F-ID>"
+		))
+		self.assertLogged('this/is/some/path/32', all=True)
 
 	def testDirectRE_2(self):
 		self.assertTrue(_test_exec(
diff --git a/fail2ban/tests/filtertestcase.py b/fail2ban/tests/filtertestcase.py
index 9fea84af..a4d542ce 100644
--- a/fail2ban/tests/filtertestcase.py
+++ b/fail2ban/tests/filtertestcase.py
@@ -2105,6 +2105,20 @@ class DNSUtilsNetworkTests(unittest.TestCase):
 		self.assertTrue(ip6.isSingle)
 		self.assertTrue(asip('192.0.2.1').isIPv4)
 		self.assertTrue(id(asip(ip4)) == id(ip4))
+		# ::
+		ip6 = IPAddr('::')
+		self.assertTrue(ip6.isIPv6)
+		self.assertTrue(ip6.isSingle)
+		# ::/32
+		ip6 = IPAddr('::/32')
+		self.assertTrue(ip6.isIPv6)
+		self.assertFalse(ip6.isSingle)
+		# path as ID, conversion as unspecified, fallback to raw (cover confusion with the /CIDR):
+		for s in ('some/path/as/id', 'other-path/24', '1.2.3.4/path'):
+			r = IPAddr(s, IPAddr.CIDR_UNSPEC)
+			self.assertEqual(r.raw, s)
+			self.assertFalse(r.isIPv4)
+			self.assertFalse(r.isIPv6)
 
 	def test_IPAddr_Raw(self):
 		# raw string:
@@ -2243,6 +2257,18 @@ class DNSUtilsNetworkTests(unittest.TestCase):
 		self.assertFalse(IPAddr('2606:2800:220:1:248:1893:25c8:1', IPAddr.CIDR_RAW).isInNet(ip6net))
 		# invalid not in net:
 		self.assertFalse(IPAddr('xxx').isInNet(ip4net))
+		# different forms in ::/32:
+		ip6net = IPAddr('::/32')
+		self.assertTrue(IPAddr('::').isInNet(ip6net))
+		self.assertTrue(IPAddr('::1').isInNet(ip6net))
+		self.assertTrue(IPAddr('0000::').isInNet(ip6net))
+		self.assertTrue(IPAddr('0000::0000').isInNet(ip6net))
+		self.assertTrue(IPAddr('0000:0000:7777::').isInNet(ip6net))
+		self.assertTrue(IPAddr('0000::7777:7777:7777:7777:7777:7777').isInNet(ip6net))
+		self.assertTrue(IPAddr('0000:0000:ffff::').isInNet(ip6net))
+		self.assertTrue(IPAddr('0000::ffff:ffff:ffff:ffff:ffff:ffff').isInNet(ip6net))
+		self.assertFalse(IPAddr('0000:0001:ffff::').isInNet(ip6net))
+		self.assertFalse(IPAddr('1::').isInNet(ip6net))
 
 	def testIPAddr_Compare(self):
 		ip4 = [
@@ -2315,7 +2341,11 @@ class DNSUtilsNetworkTests(unittest.TestCase):
 
 	def testIPAddr_CIDR_Wrong(self):
 		# too many plen representations:
-		self.assertRaises(ValueError, IPAddr, '2606:28ff:220:1:248:1893:25c8::/ffff::/::1')
+		s = '2606:28ff:220:1:248:1893:25c8::/ffff::/::1'
+		r = IPAddr(s)
+		self.assertEqual(r.raw, s)
+		self.assertFalse(r.isIPv4)
+		self.assertFalse(r.isIPv6)
 
 	def testIPAddr_CIDR_Repr(self):
 		self.assertEqual(["127.0.0.0/8", "::/32", "2001:db8::/32"],